docs: def tag_arxiv_more(line):
      """Tag old arxiv report numbers
  
      Either formats:
      * hep-th/1234567
      * arXiv:1022111 [hep-ph] which transforms to hep-ph/1022111
      """
      line = RE_ARXIV_CATCHUP.sub(ur"\g<suffix>/\g<year>\g<month>\g<num>", line)
  
      for report_re, report_repl in RE_OLD_ARXIV:
          report_number = report_repl + ur"/\g<num>"
          line = report_re.sub(
              u'<cds.REPORTNUMBER>' + report_number + u'</cds.REPORTNUMBER>',
              line
          )
      return line